Wednesday, March 22. 2006

I'm sure a lot of you have seen event 9548 in your event logs from time to time.
If 9548 isn't ringing a bell, maybe this example text will:

Disabled user /o= Organization Name /ou= Administrative Group Name /cn=Recipients/cn= Computer Name does not have a master account SID. Please use Active Directory MMC to set an active account as this user's master account.

A lot of time this will happen when you have a person leave an organization that has a mailbox that IT wants to keep around but their actual account has been deleted already. If you get enough of these, the Exchange 'clean up agents' that run from time to time will have performance problems. This also happens a lot when moving from Exchange 5.5 to Exchange 200x.